Liquid purification or separation – Filter – Within flow line or flow line connected close casing
Patent
1992-07-13
1993-12-28
Dawson, Robert A.
Liquid purification or separation
Filter
Within flow line or flow line connected close casing
210488, 2104971, 291637, 291638, B01D 2948
Patent
active
052736520
ABSTRACT:
An orifice shield for preventing blockage of an orifice restriction by large particulate matter relative to the size of an orifice restriction in a fluid power control circuit. The orifice sheild incorporates a unitary body provided with a wire coil wound about an external threaded portion of the body. The body includes an internal blind bore and longitudinal slots which cooperate to communicate with the opening between coils of the wire. One end of the body is provided with a rotational driver receiving recess to permit external thread on the body to be threaded into a mating bore. A conventional set screw or round head bolt may be readily modified to form the one piece body portion. Other embodiments are described wherein the unitary body includes an internal threaded bore to accept a removably mounted orifice restriction element wherein the orifice restriction element and shielding device forms a compact unit conveniently removably mountable into a fluid power port opening or passage threadably adapted to receive the shielding device.
REFERENCES:
patent: 3937281 (1976-02-01), Harnsberger
patent: 4133768 (1979-01-01), Theriot
patent: 4249292 (1981-02-01), Calderon
patent: 4284138 (1981-08-01), Allred
patent: 5028008 (1991-07-01), Arai
Dawson Robert A.
Millard W. L.
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